Note: Descriptions are shown in the official language in which they were submitted.
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DESCRIPTION
TITLE OF INVENTION: MOBILE COMMUNICATION METHOD AND MOBILE
STATION
TECHNICAL FIELD
[0001]
The present invention relates to a mobile communication
method and a mobile station.
BACKGROUND ART
[0002]
In the meeting for developing the specification of
LTE-Advanced, a method of setting a mobile station UE to
transmit "UE assistance information" was agreed ( see Non-patent
document 1).
[0003]
Here, the "UE assistance information" is mobile station
assistance information for prompting a radio base station eNB
to change a parameter for the mobile station UE used in the radio
base station eNB.
[0004]
Specifically, the mobile station UE is configured to
transmit "UE assistance information" to the radio base station
eNB when receiving a configuration instruction signal
(Configuration) from the radio base station eNB.
[0005]
Note that the mobile station UE is configured not to
transmit "UE assistance information" to the radio base station
eNB unless the mobile station UE receives a configuration
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instruction signal from the radio base station eNB.
[0006]
At present, two types of information of "UE power
preference" and "UE mobility information" are specified as the
"UE assistance information".
[0007]
The "UE power preference" indicates which one of "Power
Saving (battery life time)" and "Performance (delay time until
service establishment)" the mobile station UE prioritizes.
[0008]
Moreover, the "UE mobility information" indicates
information on the mobility of the mobile station UE in an
RRC IDLE state.
PRIOR ART DOCUMENT
NON-PATENT DOCUMENT
[0009]
Non-patent document 1: 3GPP contribution R2-123160
SUMMARY OF THE INVENTION
[0010]
However, the LTE-Advanced specifications agreed at
present has a problem that there is no specification on a method
of prohibiting the retransmission of "UE assistance
information" even if a mobile station UE repeatedly retransmits
"UE assistance information" after completing the setting for
transmitting the "UE assistance information."
[0011]
The present invention has been made in view of the
above-mentioned problem. An objective of the present
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invention is to provide a mobile communication method and a
mobile station that can prohibit the retransmission of the "UE
assistance information".
[0012]
A first feature of the present invention is summarized
as a mobile communication method including the steps of:
transmitting mobile station assistance information to a radio
base station by a mobile station, the mobile station assistance
information prompting the radio base station to change a
parameter for the mobile station used in the radio base station;
notifying, by the radio base station, the mobile station of a
transmission-prohibited period of the mobile station
assistance information; and stopping, by the mobile station,
retransmission of the mobile station assistance information on
the basis of the transmission-prohibited period.
[0013]
A second feature of the present invention is summarized
as a mobile communication method including the steps of:
transmitting mobile station assistance information to a radio
base station by a mobile station, the mobile station assistance
information prompting the radio base station to change a
parameter for the mobile station used in the radio base station;
notifying, by the radio base station, the mobile station of the
number of transmissions permitted for the mobile station
assistance information; and when the number of retransmissions
of the mobile station assistance information reaches the number
of transmissions permitted, stopping, by the mobile station,
the retransmission of the mobile station assistance
information.
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[0014]
A third feature of the present invention is summarized
as a mobile communication method including the steps of:
transmitting mobile station assistance information to a radio
base station by a mobile station, the mobile station assistance
information prompting the radio base station to change a
parameter for the mobile station used in the radio base station;
transmitting a dedicated signaling to the mobile station by the
radio base station, the dedicated signaling indicating
retransmission prohibition of the mobile station assistance
information; and stopping, by the mobile station, the
retransmission of the mobile station assistance information on
the basis of the dedicated signaling.
[0015]
A fourth feature of the present invention is summarized
as a mobile station including: a transmitter unit configured
to transmit mobile station assistance information to a radio
base station, the mobile station assistance information
prompting the radio base station to change a parameter for the
mobile station used in the radio base station; and a receiver
unit configured to acquire a transmission-prohibited period of
the mobile station assistance information from the radio base
station. Here, the transmitter unit stops retransmission of
the mobile station assistance information on the basis of the
transmission-prohibited period.
[0016]
A fifth feature of the present invention is summarized
as a mobile station including: a transmitter unit configured
to transmit mobile station assistance information to a radio
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base station, the mobile station assistance information
prompting the radio base station to change a parameter for the
mobile station used in the radio base station; and a receiver
unit configured to acquire the number of transmissions
permitted for the mobile station assistance information from
the radio base station. Here, when the number of
retransmissions of the mobile station assistance information
reaches the number of transmissions permitted, the transmitter
unit stops the retransmission of the mobile station assistance
information.
[0017]
A sixth feature of the present invention is summarized
as a mobile station including: a transmitter unit configured
to transmit mobile station assistance information to a radio
base station, the mobile station assistance information
prompting the radio base station to change a parameter for the
mobile station used in the radio base station; and a receiver
unit configured to receive a dedicated signaling from the radio
base station, the dedicated signaling indicating
retransmission prohibition of the mobile station assistance
information. Here, the transmitter unit stops the
retransmission of the mobile station assistance information on
the basis of the dedicated signaling.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018]
[Fig. 1] Fig. 1 is an overall configuration diagram of
a mobile communication system according to a first embodiment
of the present invention.
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[Fig. 2] Fig. 2 is a functional block diagram of a radio
base station according to the first embodiment of the present
invention.
[Fig. 3] Fig. 3 is a functional block diagram of a mobile
station according to the first embodiment of the present
invention.
[Fig. 4] Fig. 4 is a sequence diagram illustrating an
operation of the mobile communication system according to the
first embodiment of the present invention.
[Fig. 5] Fig. 5 is a sequence diagram illustrating an
operation of a mobile communication system according to a
modification example 1 of the present invention.
[Fig. 6] Fig. 6 is a sequence diagram illustrating an
operation of a mobile communication system according to a
modification example 2 of the present invention.
MODE FOR CARRYING OUT THE INVENTION
[0019]
(Mobile Communication System of First Embodiment of Present
Invention)
A mobile communication system according to a first
embodiment of the present invention will be described with
reference to Fig. 1 to Fig. 4.
[0020]
Although an LTE-Advanced mobile communication system
will be described as an example in the embodiment, the present
invention is not limited to the LTE-Advanced mobile
communication system but can be applied to a mobile
communication system of another scheme.
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[0021]
The mobile communication system according to the
embodiment is provided with a radio base station eNB and a mobile
station UE, as illustrated in Fig. 1.
[0022]
The radio base station eNB is provided with a transmitter
unit 11 and a receiver unit 12, as illustrated in Fig. 2.
[0023]
The transmitter unit 11 is configured to transmit various
kinds of signals to the mobile station UE, and the receiver unit
12 is configured to receive various kinds of signals from the
mobile station UE.
[0024]
The transmitter unit 11 is configured to transmit a
configuration instruction signal (Configuration) described
above to the mobile station UE, for example.
[0025]
Moreover, the transmitter unit 11 may be configured to
notify the mobile station UE of a transmission-prohibited
period (Prohibit timer) of "UE assistance information".
[0026]
The transmitter unit 11 may be configured to notify the
mobile station UE of the transmission-prohibited period using
an information element "Mac-MainConfig" in an information
element "RadioResourceConfigDedicated" included in an "RRC
Connection Setup (connection setting signal) ", an "RRC
Connection Reconfiguration (connection resetting signal) ", an
"RRC Connection Reestablishment (connection reestablishing
signal) ", or the like, for example. Note that, any unit can
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be used as a unit for the transmission-prohibited period.
[0027]
For example, as the transmission-prohibited period, the
transmitter unit 11 may be configured to notify the mobile
station UE of "x seconds" showing the time or "x pieces" showing
the number of sub-frames.
[0028]
In addition, as the transmission-prohibited period, the
transmitter unit 11 may be configured to notify the mobile
station UE of a value (for example, "0") indicating that the
transmission-prohibited period is not set, or a value (for
example, "infinite") indicating that "UE assistance
information" is transmitted only once, and thereafter the
transmission is prohibited unless a configuration instruction
signal is received again.
[0029]
Moreover, the receiver unit 12 may be configured to
acquire the "UE assistance information" transmitted by the
mobile station UE.
[0030]
The mobile station UE is provided with a receiver unit
21, a management unit 22, and a transmitter unit 23, as
illustrated in Fig. 3.
[0031]
The receiver unit 21 is configured to receive various
kinds of signals from the radio base station eNB, and the
transmitter unit 23 is configured to transmit various kinds of
signals to the radio base station eNB.
[0032]
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For example, the transmitter unit 23 is configured to
transmit "UE assistance information" to the radio base station
eNB after the receiver unit 21 receives a configuration
instruction signal (Configuration) described above from the
radio base station eNB.
[0033]
Herein, the transmitter unit 23 may be configured to
repeatedly transmit "UE assistance information" at a
predetermined interval.
[0034]
Moreover, the receiver unit 21 is configured to acquire
a transmission-prohibited period of the "UE assistance
information" from the radio base station eNB.
[0035]
Herein, the management unit 22 is configured to manage
the transmission-prohibited period of the "UE assistance
information" acquired by the receiver unit 21.
[0036]
The transmitter unit 23 is configured to stop
retransmission of the "UE assistance information" on the basis
of the transmission-prohibited period.
[0037]
For example, the transmitter unit 23 is configured to,
when the receiver unit 21 acquires the transmission-prohibited
period, transmit the "UE assistance information" only once, and
thereafter stop transmission of the "UE assistance information"
during a period (for example, x seconds or a period of x
sub-frames) specified by the transmission-prohibited period.
[0038]
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Further, the transmitter unit 23 is configured to restart
the transmission of the "UE assistance information" after the
elapse of the period specified by the transmission-prohibited
period.
[0039]
Note that, the transmitter unit 23 may be configured not
to stop the transmission of the "UE assistance information" when
the receiver unit 21 acquires "0" as the
transmission-prohibited period.
[0040]
Alternatively, when the receiver unit 21 acquires
"infinite" as the transmission-prohibited period, the
transmitter unit 23 may transmit the HUE assistance
information" only once, and thereafter be kept from
transmitting "UE assistance information" unless the receiver
unit 21 receives again a configuration instruction signal.
[0041]
Hereinafter, an operation of the mobile communication
system according to the embodiment will be described with
reference to Fig. 4.
[0042]
As illustrated in Fig. 4, when transmission of HUE
assistance information" is set at step S1000, the mobile station
UE repeatedly transmits the HUE assistance information" to the
radio base station eNB at step S1001.
[0043]
The radio base station eNB transmits an "RRC Connection
Reconfiguration" including a transmission-prohibited period
(Prohibit timer) described above to the mobile station UE at
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step S1002.
[0044]
Upon receiving the "RRC Connection Reconfiguration", the
mobile station UE transmits "UE assistance information" at step
S1003, and then stops the transmission of the "UE assistance
information" at step S1004.
[0045]
Thereafter, after the elapse of the period specified by
the transmission-prohibited period, the mobile station UE
restarts the transmission of the "UE assistance information"
at step S1005.
[0046]
With the mobile communication system according to the
embodiment, the radio base station eNB notifies the mobile
station UE of the transmission-prohibited period described
above, so that the retransmission of the "UE assistance
information" by the mobile station UE can be prohibited.
[0047]
(Modification Example 1)
Hereinafter, a mobile communication system according to
a modification example 1 of the present invention will be
described with reference to Fig. 5 in terms of the difference
from the abovementioned mobile communication system according
to the first embodiment.
[0048]
In the mobile communication system according to the
modification example 1, the transmitter unit 11 of the radio
base station eNB is configured to notify the mobile station UE
of the number of transmissions permitted for "UE assistance
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information".
[0049]
The transmitter unit 11 may be configured to notify the
mobile station UE of the number of transmissions permitted by
using an information element "Mac-MainConfig" in an information
element "RadioResourceConfigDedicated" included in an "RRC
Connection Setup", an "RRC Connection Reconfiguration", an "RRC
Connection Reestablishment", or the like, for example.
[0050]
Moreover, the transmitter unit 11 may be configured to
notify the mobile station UE of, as the number of transmissions
permitted, a value (for example, "0") indicating that no
transmission of the "UE assistance information" is permitted,
or a value (for example, "infinite") indicating that no
retransmission of the "UE assistance information" is
prohibited.
[0051]
Moreover, when the number of retransmissions of the "UE
assistance information" reaches the number of transmissions
permitted received by the receiver unit 21 in the mobile station
UE, the transmitter unit 23 is configured to stop retransmission
of the "UE assistance information".
[0052]
In this case, before the receiver unit 21 receives again
the configuration instruction signal described above from the
radio base station eNB, the transmitter unit 23 is configured
not to restart the retransmission of the "UE assistance
information".
[0053]
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Note that, the transmitter unit 23 may be configured to,
when the receiver unit 21 acquires "0" as the number of
transmissions permitted, stop the transmission of the "OE
assistance information" without transmitting the "UE
assistance information" even once.
[0054]
Alternatively, the transmitter unit 23 may be configured
not to stop the transmission of the "UE assistance information"
when the receiver unit 21 acquires "infinite" as the number of
transmissions permitted.
[0055]
Hereinafter, an operation of the mobile communication
system according to the modification example 1 will be described
with reference to Fig. 5.
[0056]
As illustrated in Fig. 5, when transmission of "UE
assistance information" is set at step S2000, the mobile station
UE repeatedly transmits the "UE assistance information" to the
radio base station eNB at step S2001.
[0057]
The radio base station eNB transmits an "RRC Connection
Reconfiguration" including the number of transmissions
permitted described above to the mobile station UE at step
S2002.
[0058]
Upon receiving the "RRC Connection Reconfiguration", the
mobile station UE repeats the retransmission of the "UE
assistance information" before the number of retransmissions
of the "UE assistance information" reaches the number of
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transmissions permitted "x" at step S2003.
[0059]
Thereafter, when the number of retransmissions of the "UE
assistance information" reaches the number of transmissions
permitted "x", the mobile station UE stops the transmission of
the "UE assistance information" at step S2004.
[0060]
Thereafter, when receiving a configuration instruction
signal (Configuration) described above from the radio base
station eNB at step S2005, the mobile station UE restarts the
transmission of the "UE assistance information" at step S2006.
[0061]
With the mobile communication system according to the
modification example 1, the radio base station eNB notifies the
mobile station UE of the number of transmission allowance times
described above, so that the retransmission of the "UE
assistance information" by the mobile station UE can be
prohibited.
[0062]
(Modification Example 2)
Hereinafter, a mobile communication system according to
a modification example 2 of the present invention will be
described with reference to Fig. 6 in terms of the difference
from the abovementioned mobile communication systems according
to the first embodiment and the modification example 1.
[0063]
In the mobile communication system according to the
modification example 2, the transmitter unit 11 of the radio
base station eNB is configured to transmit a dedicated signaling
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indicating retransmission prohibition of the "UE assistance
information" to the mobile station UE.
[0064]
The transmitter unit 11 may be configured to use, as the
dedicated signaling, an "RRC Connection Setup", an "RRC
Connection Reconfiguration", or an "RRC Connection
Reestablishment", for example.
[0065]
The dedicated signaling may be configured to include an
information element "RRC UE assistance config" indicating the
retransmission prohibition of the "UE assistance information".
[0066]
The transmitter unit 23 of the mobile station UE is
configured to stop the retransmission of the "UE assistance
information" on the basis of the dedicated signaling.
[0067]
Herein, the transmitter unit 23 is configured to restart
the retransmission of the "UE assistance information" when the
receiver unit 21 receives a dedicated signaling including an
information element "RRC UE assistance config" indicating the
retransmission permission of the "UE assistance information".
[0068]
Note that, the "RRC UE assistance config" may be
configured to indicate the retransmission prohibition or the
retransmission permission for each of the "UE power preference"
and the "UE mobility information" as illustrated in Fig. 6, or
may be configured to indicate the transmission prohibition or
the retransmission permission for both the "UE power
preference" and the "UE mobility information" all together
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without distinction of them.
[0069]
Herein, the "RRC UE assistance config" may be configured
in one bit if the "UE power preference" and the "UE mobility
information" are not distinguished from each other.
[0070]
Hereinafter, an operation of the mobile communication
system according to the modification example 2 will be described
with reference to Fig. 6.
[0071]
As illustrated in Fig. 6, when transmission of "UE
assistance information" is set at step S3000, the mobile station
UE repeatedly transmits the "UE assistance information" to the
radio base station eNB at step S3001.
[0072]
The radio base station eNB transmits an information
element "RRC UE assistance config" indicating the
retransmission prohibition of the "UE power preference" and
indicating the retransmission permission of the "UE mobility
information" to the mobile station UE at step S3002.
[0073]
Upon receiving the "RRC UE assistance config", the mobile
station UE stops the retransmission of the "UE power preference"
at step S3003.
[0074]
Even in this case, the mobile station UE can continue the
retransmission of the "UE mobility information" at step S3004.
[0075]
Thereafter, upon receiving an information element "RRC
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UE assistance config" indicating the retransmission permission
of the "UE power preference" and the retransmission permission
of the "UE mobility information" from the radio base station
eNB at step S3005, the mobile station UE determines to restart
the transmission of the "UE power preference" at step S3006,
and transmits "UE assistance information" including the "UE
power preference" and the "UE mobility information" to the radio
base station eNB at step S3007.
[0076]
With the mobile communication system according to the
modification example 2, the radio base station eNB transmits
the dedicated signaling described above to the mobile station
UE, so that the retransmission of the "UE assistance
information" by the mobile station UE can be prohibited.
[0077]
The above-described features of the embodiment may also
be expressed as follows.
[0078]
A first feature of the embodiment is summarized as a mobile
communication method including the steps of: transmitting "UE
assistance information (mobile station assistance
information) " to a radio base station eNB by a mobile station
UE, the "UE assistance information" prompting the radio base
station eNB to change a parameter for the mobile station UE used
in the radio base station; notifying, by the radio base station
eNB, the mobile station UE of a transmission-prohibited period
of the "UE assistance information"; and stopping, by the mobile
station UE, retransmission of the "UE assistance information"
on the basis of the transmission-prohibited period.
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[0079]
A second feature of the embodiment is summarized as a
mobile communication method including the steps of:
transmitting HUE assistance information" to a radio base
station eNB by a mobile station UE, the "UE assistance
information" prompting the radio base station eNB to change a
parameter for the mobile station UE used in the radio base
station; notifying, by the radio base station eNB, the mobile
station UE of the number of transmissions permitted for the HUE
assistance information"; and when the number of retransmissions
of the "UE assistance information" reaches the number of
transmissions permitted, stopping, by the mobile station UE,
the retransmission of the "UE assistance information".
[0080]
A third feature of the embodiment is summarized as a mobile
communication method including the steps of: transmitting HUE
assistance information" to a radio base station eNB by a mobile
station UE, the "UE assistance information" prompting the radio
base station eNB to change a parameter for the mobile station
UE used in the radio base station; transmitting a dedicated
signaling to the mobile station UE by the radio base station
eNB, the dedicated signaling indicating retransmission
prohibition of the HUE assistance information"; and stopping,
by the mobile station UE, the retransmission of the "UE
assistance information" on the basis of the dedicated
signaling.
[0081]
A fourth feature of the embodiment is summarized as a
mobile station UE including: a transmitter unit 23 configured
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to transmit "UE assistance information" to a radio base station
eNB, the "UE assistance information" prompting the radio base
station eNB to change a parameter for the mobile station UE used
in the radio base station; and a receiver unit 21 configured
to acquire a transmission-prohibited period of the "UE
assistance information" from the radio base station eNB. Here,
the transmitter unit 23 stops retransmission of the "UE
assistance information" on the basis of the
transmission-prohibited period.
[0082]
A fifth feature of the embodiment is summarized as a mobile
station UE including: a transmitter unit 23 configured to
transmit "UE assistance information" to a radio base station
eNB, the "UE assistance information" prompting the radio base
station eNB to change a parameter for the mobile station UE used
in the radio base station; and a receiver unit 21 configured
to acquire the number of transmissions permitted for the "UE
assistance information" from the radio base station eNB. Here,
when the number of retransmissions of the "UE assistance
information" reaches the number of transmissions permitted, the
transmitter unit 23 stops the retransmission of the "UE
assistance information".
[0083]
A sixth feature of the embodiment is summarized as a mobile
station UE including: a transmitter unit 23 configured to
transmit "UE assistance information" to a radio base station
eNB, the "UE assistance information" prompting the radio base
station eNB to change a parameter for the mobile station UE used
in the radio base station; and a receiver unit 21 configured
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to receive a dedicated signaling from the radio base station
eNB, the dedicated signaling indicating retransmission
prohibition of the "UE assistance information". Here, the
transmitter unit 23 stops the retransmission of the "UE
assistance information" on the basis of the dedicated
signaling.
[0084]
It should be noted that the foregoing operations of the
mobile station UE and the radio base station eNB may be
implemented by hardware, maybe implemented by a software module
executed by a processor, or may be implemented in combination
of the two.
[0085]
The software module may be provided in a storage medium
in any format, such as a RAM (Random Access Memory), a flash
memory, a ROM (Read Only Memory), an EPROM (Erasable
Programmable ROM), an EEPROM (Electronically Erasable and
Programmable ROM), a register, a hard disk, a removable disk,
or CD-ROM.
[0086]
The storage medium is connected to a processor so that
the processor can read and write information from and to the
storage medium. Instead, the storage medium may be integrated
in a processor. The storage medium and the processor may be
provided inside an ASIC. Such an ASIC may be provided in the
mobile station UE and the radio base station eNB. Otherwise,
the storage medium and the processor maybe provided as discrete
components inside the mobile station UE and the radio base
station eNB.
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[0087]
Hereinabove, the present invention has been described
in detail by use of the foregoing embodiments. However, it is
apparent to those skilled in the art that the present invention
should not be limited to the embodiments described in the
specification. The present invention can be implemented as an
altered or modified embodiment without departing from the scope
of the present invention. Therefore, the description of the
specification is intended for illustrative explanation only,
and the scope of the claims should not be limited by the preferred
embodiments set forth herein, but should be given the broadest
interpretation consistent with the description as a whole.
[0088]
INDUSTRIAL APPLICABILITY
[0089]
As described above, according to the present invention,
it is possible to provide a mobile communication method and
a mobile station that can prohibit the retransmission of the
"UE assistance information".
EXPLANATION OF THE REFERENCE NUMERALS
[0090]
eNB radio base station
UE radio base station
11, 23 transmitter unit
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12, 21 receiver unit
22 management unit
22
